OCR Physics A G484 - The Newtonian World - 11th June 2015 Watch

s081013
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#1541
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#1541
(Original post by chukster97)
where was the 41? i dont remember seeing that
we had to work that out by ourselves, i think that's the number of moles of helium.
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ETRC
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#1542
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#1542
lost 3 marks on first page- question made no sense
probably lost 1 mark for a- i got a negative sign but correct answer
lost 3 marks for explanation afterwards

lost 6 marks in shm- my graph was not negative gradient, messed up a/x and amplitude was not decreasing

lost 3 marks somewhere for sure for some of the explain questions

didn't add up volumes (i still think my answer is correct and you don't add volumes) 1 mark

so at best i think i can get 45-46 with follow through marks

did worse in this than f324 lol
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Bjc00
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#1543
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#1543
(Original post by sagar448)
Was it conservation of momentum when we were working out the acceleration of the spacecraft? PLEASE TELL ME IT WAS
I did N2 because worked out rate of change of momentum then divided by mass. F=ma and F=delta P/delta T
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sagar448
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#1544
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#1544
(Original post by ETRC)
lost 3 marks on first page- question made no sense
probably lost 1 mark for a- i got a negative sign but correct answer
lost 3 marks for explanation afterwards

lost 6 marks in shm- my graph was not negative gradient, messed up a/x and amplitude was not decreasing

lost 3 marks somewhere for sure for some of the explain questions

didn't add up volumes (i still think my answer is correct and you don't add volumes) 1 mark

so at best i think i can get 45-46 with follow through marks

did worse in this than f324 lol
What do you mean a-? What question was that?
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ETRC
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#1545
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#1545
(Original post by sagar448)
Was it conservation of momentum when we were working out the acceleration of the spacecraft? PLEASE TELL ME IT WAS
probably newton's second law

this paper was worse than f324
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Bjc00
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#1546
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#1546
(Original post by ETRC)
lost 3 marks on first page- question made no sense
probably lost 1 mark for a- i got a negative sign but correct answer
lost 3 marks for explanation afterwards

lost 6 marks in shm- my graph was not negative gradient, messed up a/x and amplitude was not decreasing

lost 3 marks somewhere for sure for some of the explain questions

didn't add up volumes (i still think my answer is correct and you don't add volumes) 1 mark

so at best i think i can get 45-46 with follow through marks

did worse in this than f324 lol
That'll still be an A
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ETRC
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#1547
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#1547
(Original post by sagar448)
What do you mean a-? What question was that?
in 2nd question where you had to work out acceleration

i got correct magnitude buy i had a negative sign at front
i messed up my momentum im an idiot
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ETRC
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#1548
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#1548
(Original post by Bjc00)
That'll still be an A
Hopefully because my practical grade was like 33/40.

I need to get 85+ in g485 now. i never did good in the small physics units.
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Chung224
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#1549
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#1549
grade boundary predictions guys?
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trooken
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#1550
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#1550
Poorly worded questions. Particularly the first and last ones
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Faded-Pi
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#1551
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#1551
Much worse than last year's. Where was the circular motion? The brownian motion? And that first question!
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leroythelost
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#1552
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#1552
Hey guys do you remember that question to do with inccreasing the freq of oscillation of the spring from 0 to about 12hz I think and you had to describe and explain. the motion of the metal plate.

Well i drew a graph of a/m(****ed up here i was thinking about amplitude rather than acceleration) over f/hz and I drew curve from the origin upwards. I then said that the acc was proportional to the frequency squared.
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Jackasnacks
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#1553
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#1553
the three marker with a graph you had to label yourself with f increased to 12Hz
Was that a resonance graph or nah completely f'd that one
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Hazza_
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#1554
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#1554
Was the acceleration of the xenon space craft thing very small? On the order of 10^-3 ms^-2
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ecsefem
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#1555
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#1555
I believe the law could have either been Newton's 2nd or conservation of momentum depending on how you worked it out
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leroythelost
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#1556
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#1556
What grade do you need in physics overall? I need an A and I got 34/40 for practical skills
(Original post by ETRC)
Hopefully because my practical grade was like 33/40.

I need to get 85+ in g485 now. i never did good in the small physics units.
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ETRC
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#1557
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#1557
(Original post by Jackasnacks)
the three marker with a graph you had to label yourself with f increased to 12Hz
Was that a resonance graph or nah completely f'd that one
i only knew it was resonance because of the pencil mark lol
you had to draw a peak and label it natural frequency

then just explain resonance and say amplitude is maximum
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Jackasnacks
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#1558
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#1558
(Original post by leroythelost)
Hey guys do you remember that question to do with inccreasing the freq of oscillation of the spring from 0 to about 12hz I think and you had to describe and explain. the motion of the metal plate.

Well i drew a graph of a/m(****ed up here i was thinking about amplitude rather than acceleration) over f/hz and I drew curve from the origin upwards. I then said that the acc was proportional to the frequency squared.
I wrote about f^2 prop to acc too
Whyyy didn't I read it properly
Only 3 marks yolo
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Bjc00
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#1559
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#1559
(Original post by Jackasnacks)
the three marker with a graph you had to label yourself with f increased to 12Hz
Was that a resonance graph or nah completely f'd that one
yes it was
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MMB07
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#1560
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#1560
Question 2: State in words the law used to determine your answer to i)

Mark scheme from OCR: DO NOT ALLOW NEWTON'S 2nd LAW, as in question 1 we claimed that newton was wrong
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